It seems a lot hairier on the legs and head than the A. bispinsus I've seen so far, the head also seems broader, and abdomen the abdomen looks wider and flatter dorsally. The dorsal surface of the abdomen also seems less hairy. But, these guys are so variable... It could be an immature too? I wish I'd shot a ventral!

I'm not familiar with them though, Lynette will likely weigh in.

is that these seem quite hard to separate. I think that Alice is going to continue to ID these based on scapes and eventually get the hang of each species. Then she'll be able to tell us which is which. =]

That being said, I was also leaning toward A. bispinosus on this one.

The differences I noted could just be regional, I've yet to photograph any adults at this location this season. I'm going to try to get pedipalp shots of the males too (John & Jane pointed out some promising immobilization techniques).

While some of the A. bispinosus posted resemble Levi's abdominal sketch in his 1973 paper with the small recurved line basal and medial like this one, none of the A. montereyensis seem to.

It's what I call a "W" mark. I was noticing that it is often present on bispinosus, but unfortunately not always. I think perhaps when they get really swollen it becomes too hard to see.